Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 187

do not use the key and keep it away from
children.
If batteries are swallowed, seek medical
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attention immediately.
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ENVIRONMENTAL NOTE Environmental
damage due to improper disposal of bat-
teries
Batteries contain toxic and corrosive
substances.
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Take discharged batteries to a
qualified specialist workshop or to a col-
lection point for used batteries.
Requirements:
One CR2450 lithium battery
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Push a pointed object into recess 1.
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Slide battery cover 2 backwards in the direc-
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tion of the arrow.
3
Insert new battery with the lettering facing
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upwards.
Slide battery cover 2 in the opposite direc-
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tion to the arrow onto the remote control until
the battery cover engages.
P223 0288 02
Climate control 185
▌Problems with the remote control for the sta-
tionary heater/ventilation
FAIL ¨ appears on the remote control display
Possible cause:
The signal transmission between the transmit-
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ter and the receiver is malfunctioning.
Change your position in relation to the vehicle,
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moving closer if necessary.
FAIL appears on the remote control display
Possible cause:
The starter battery is not sufficiently charged.
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Charge the starter battery.
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Possible cause:
The outside temperature is higher than 15 °C.
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Use the stationary heater only if the outside
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temperature is below 15 °C.
Possible cause:
The fuel tank is not sufficiently filled.
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Refuel at the nearest filling station.
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